unable to use opera?

I might be wrong but this was my experience. Accessing the internet via Opera is a network based service. It is possible that your network service provider has blocked all access to the internet except for the wap sites which you are obviously able to go to. As long as you can access wap thru gprs I think there's nothing wrong with your phone. You might want to call your network service provider and inquire about it. Just my 2 cents...